The plumbing is almost done. One pipe serves as a drain line from three of the farm tanks on this side a divider wall. Another pipe serves as the drain line from three additional farm tanks housed on the opposite side of the divider wall. A third pipe serves as the drain line from a 180 gallon display tank that is slaved into the farm system. Having the display tank, with its heavy load of fish, helps us keep bio-load at the desired level for optimum growth of our aqua-cultured corals. It also helps with culturing helpful bacteria for the system. The fourth pipe return clean water to our coral farm after being manually filtered and then cleaned by our Royal Exclusive DeLuxe 400 skimmer.